Magnetic disk substrate and method of manufacturing the same

A magnetic disk substrate comprising 0.5 wt% to 1.0 wt% of Mo, 0.03 wt% to 0.5 wt% of O + 2N + 0.75C, and a balance of Ti. The alloy plate having a composition of above range is cold-rolled at a rolling ratio of 30% or more to form a magnetic disk substrate material, and the material is thermal-flat...

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Bibliographic Details
Main Authors SUENAGA, HIROYOSHI, FUKAI, HIDEAKI, MINAKAWA, KUNINORI
Format Patent
LanguageEnglish
French
German
Published 31.08.1994
Edition5
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:A magnetic disk substrate comprising 0.5 wt% to 1.0 wt% of Mo, 0.03 wt% to 0.5 wt% of O + 2N + 0.75C, and a balance of Ti. The alloy plate having a composition of above range is cold-rolled at a rolling ratio of 30% or more to form a magnetic disk substrate material, and the material is thermal-flattened under the following condition: 500 </= T </= -(150/11).t + 7850/11 1 </= t where T represents a thermal-flattening temperature ( DEG C), and t represents a thermal-flattening time (houre), thereby obtaining a magnetic disk substrate having the average grain size of 30 mu m or less.
Bibliography:Application Number: EP19900111229